No, don't get us wrong your set up looks great, it WILL work fine, there is no best set up, everyone has their own techniques and tricks that they tweak over the years. We were just really comparing how things are different in the uk to north america and sharing a few ideas. I just assumed the roots would grow out of the bags and into the tray. If this is the case you should cover the roots. Alot of people dont get on with rockwool, personally I love it. If everything is looking healthy just keep it up, you will succeed.

All the best

Subzero.